Arrows in the energy diagram below represent enthalpy changes occurring in the exothermic formation of a solution:
ΔHsoln = enthalpy of solution
ΔHsolute-solute = enthalpy change involving solute-solute interactions
ΔHsolute-solvent = enthalpy change involving solute-solvent interactions
ΔHsolvent-solvent = enthalpy change involving solvent-solvent interactions 
-Which arrows represent ΔHsolute-solute and ΔHsolvent-solvent?
Definitions:
Variable Cost
Expenses that vary in direct proportion to changes in the level of production or sales volume.
Fixed Cost
Costs that remain constant in total amount with changes in the volume of activity, such as rent and salaries.
Mixed Cost
Expenses that have both fixed and variable components, changing with the level of activity but also containing a static element.
Margin Of Safety
The difference between actual or projected sales and the break-even point, indicating the amount of sales that can decline before a business incurs a loss.
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